[Bug 110674] Crashes / Resets From AMDGPU / Radeon VII

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110674

--- Comment #136 from tom91136 at gmail.com ---
Been following this thread for a while now as I just got 3 4k 60Hz monitors
connected to the 3 DP ports on my Radeon VII. 
I'm getting the exact same errors discussed in this report with matching dmesg
outputs.

I've applied the patches to Fedora 31's 5.3.0-3 kernel and everything now works
perfectly!

Just a few notes:

* Idle power draw before patch was 22W in lm_sensors, now it's reading 28W,
makes sense as the memory is now properly clocked. This also loosely matches
@Tom B's results.

* I did not get the repeated `[drm] schedsdma0 is not ready, skipping` in
dmesg, however, it is still possible to trigger a freeze by toggling dpms:

    xset dpms force off

Resulting in:

[  155.431068] amdgpu: [powerplay] Failed to send message 0x28, response 0x0
[  155.431070] amdgpu: [powerplay] [SetHardMinFreq] Set hard min uclk failed!
[  161.334003] amdgpu: [powerplay] Failed to send message 0x26, response 0x0
[  161.334004] amdgpu: [powerplay] Failed to set soft min gfxclk !
[  161.334005] amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
[  164.622060] amdgpu: [powerplay] Failed to send message 0x28, response 0x0
[  164.622062] amdgpu: [powerplay] [SetHardMinFreq] Set hard min uclk failed!


Previously, without the patch, the machine hangs. With the patch, the display
freezes for a few seconds and then power off. Mouse movement correctly turns on
all screen and everything is back to normal.

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